Method for Comprehensive Recovery of Phosphorus and Rare Earth from Monazite-containing Rare Earth Phosphate Rock

Abstract

The invention discloses a method for comprehensively recycling phosphorus and rare earth from rare earth phosphorite containing monazite. The method includes the following steps that rare earth phosphorite containing monazite is obtained from phosphoric acid in a leaching manner, and a monocalcium phosphate solution containing rare earth and slag containing monazite are obtained through filtration; the monocalcium phosphate solution containing rare earth is processed through a precipitation method, dissolved rare earth precipitates, a monocalcium phosphate solution and rare earth slag containing phosphoric acid are obtained through filtration, and the rare earth slag containing phosphoric acid and slag containing monazite are mixed to form mixed slag; and phosphorus in the monocalcium phosphate solution is recycled, and rare earth in the mixed slag is recycled. Acid leaching is conducted by adding phosphoric acid, phosphorus in rare earth phosphorite containing monazite forms monocalcium phosphate high in solubility, and therefore monazite existing in a precipitation manner and phosphorus can be separated. Then, the monocalcium phosphate solution containing rare earth is processed through the precipitation method, and rare earth and phosphorus elements in phosphorite can be effectively separated. Rare earth and phosphorus are effectively separated through two times of separation steps, and therefore the rare earth recycling rate is increased.

Description

technical field [0001] The invention relates to the field of rare earth recovery, in particular to a method for comprehensively recovering phosphorus and rare earth from monazite-containing rare earth phosphate ore. Background technique [0002] Rare earth minerals often coexist with barite, calcite, apatite, silicate ore and other minerals in nature. Due to the different mineralization reasons of minerals, the occurrence state and content of rare earth elements in minerals are also different. In the rare earth-containing ores currently mined, the content of rare earth oxides is only a few percent, or even lower. In order to meet the needs of rare earth metallurgical production, the rare earth must be separated from other ores by beneficiation before smelting, so that the rare earth minerals can be enriched. The content of rare earth oxides in minerals enriched by ore dressing can reach more than 60%-70%. Minerals enriched with rare earths are usually called rare earth co...

AI Technical Summary

Problems solved by technology

When recovering rare earth elements and phosphorus elements in this mixed ore, it is difficult to achieve effective separation of ores by physical beneficiation due to the difficulty of enveloping and dissociation of various substances in the mixed ore

In particular, since the decomposition of monazite requires relatively harsh conditions, such as higher temperature and pH, etc., when using the sulfuric acid method in the prior art to wet treat phosphate rock containing monazite, it is often impossible to completely decompose monazite. can realize its effective recycling

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